Compound for preparation of high-strength polyolefin permeable membrane and preparation method thereof

Abstract

The invention discloses a compound for preparation of a high-strength polyolefin permeable membrane and a preparation method thereof. The compound comprises the following components in parts by weight: 35-65 of polyolefin resin, 30-60 of micron inorganic filler, 1-10 of nano inorganic filler, 0.2-0.5 of antioxidant, 0.1-1.0 of processing aid and 0.1-3.0 of coupling agent. The invention can improve the mechanical properties of the polyolefin permeable membrane through reasonable selection of the polyolefin resin and the nano inorganic filler, thereby reducing the thickness of the permeable membrane under the condition that the use requirements are satisfied. Moreover, the invention not only can fully develop the strengthening function of the nano filler, but also can obtain the permeable membrane with uniform aperture distribution and with water pressure resistance up to 100cm through the reasonable surface processing and the economical process flow. The transverse tensile strength of the permeable membrane is higher than 15MPa, the vertical tensile strength of the permeable membrane is higher than 30MPa, and the water pressure test reaches a 100cm water column, that is, the membrane can bear the 100cm water column without water permeation, breakage and the like.

Description

technical field [0001] The invention relates to the technical field of polyolefin gas-permeable membranes, in particular to a compound used for preparing high-strength polyolefin gas-permeable membranes and its preparation technology. Background technique [0002] The breathable film can be formed by mixing thermoplastic polymer with a certain proportion of mineral fillers, casting or blown into a film through an extruder, and then stretching longitudinally or transversely to form voids around the filler particles. The size of the polyolefin can be controlled, it allows water vapor, air and other gases to pass through but does not allow liquids to pass through, so as to obtain a breathable and impermeable polyolefin breathable membrane. [0003] This functional film product has been widely used in personal hygiene products, medical clothing, food packaging, crop preservation, building waterproofing and other fields. In these fields, most occasions need to print the surface ...

AI Technical Summary

Problems solved by technology

The addition of amino silicone oil is easy to form die head smoke during the film making process, and then form die head oil beads and fouling, resulting in longitudinal stripes and oil bead pollution on the film surface

In addition, the nano-calcium carbonate and heavy calcium carbonate are first made into masterbatches and then granulated with other components through a twin-screw extruder. Although it is conducive to the dispersion of fillers, the process is complicated and the processing cost is high.

[0008] Although the above patents are consciously or unconsciously improving the mechanical properties of the breathable membrane, none of them combine nano-inorganic fillers, matrix resin selection, surface treatment methods, etc. to improve the mechanical properties of the breathable membrane.